80%of grade is 90, 20% is 80. How do I find out what the grade is?

Need answer asap. Thanks.

Update:

I'm not understanding the answers.

Do I add the 80 and 90 and divide by 2? I am given this chart A-s100-90, B is 89-80, Cis 79-70, D is 69-60 and F is less.

8 Answers

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  • 1 decade ago
    Favorite Answer

    Let's look at it this way.

    Overall you can get 100 points.

    The first part is worth 80 points, the second part is worth 20 points.

    On part one, you got 90 percent of the possible 80 points.

    .90 x 80 = 72 points (out of the 80 possible)

    On part two, you got 80 percent of the possible 20 points.

    .80 x 20 = 16 points (out of the possible 20 points)

    72 + 16 = 88 points out of the possible 100.

    So you get a B.

    Maybe a B+ if they're being generous.

    =

  • 1 decade ago

    1) 80% of grade is 90

    90 divided by 80% times 100% =200

    2) 20% is 80.

    20 divided by 80 times 100

    =25

  • Anonymous
    1 decade ago

    80% + 20% = 100%

    90 + 80 = 170

    OR

    what do you mean? 100%?

    10% = 40, in other words half 80

    100% = 400, 10% x 10

    OR

    20% x 5 = 100%

    80 x 5 = 400

    Source(s): my knowledge
  • 1 decade ago

    (90 x .80) + (80 x .20) = 88

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  • 1 decade ago

    .8 times 90

    plus

    .2 times 80

    equals percentage.

  • 1 decade ago

    If the grade is X,then 0.8X=90,so the grade must beX= 90/0.8=112.5

    and also 0.2X=80 so X=400.The question is NOT self-consistant.

  • 1 decade ago

    .8 * 90 + .2 * 80

    those are multiplication signs by the way.

  • 1 decade ago

    0.8 * 90 + 0.2 * 80 = 88

    the grade is 88%

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